Surface-indicator.



J. W. GHBEN.

SURFACE INDIGTR.

APPLICATION FILED 1.111,4, 1912.

Patented May f2s, 1914 www llmml v1 Q 1.1 tFig. f2 Fids. .32A Land l "The form a continuation thereo ad";hef5int1e e extends from the head H into the shank A, there being an annular groove in the periphery of the pintle to receive the spring- 3i w I' 511g j: -1 SURFACE-INDICATOR.-

g the scale K are 1 the" lever I engeglng third Elev'errJ is pVQted= il. @t er y exaggi ate e gfdiffl n?, ntended to`"'s1`1w` variations of one-thousandth of an inch. in the Contact 110 points. The spring O is fixed in the housing to engage the fourth lever L and throw it to the left. The slide T is mounted `in a slot in the flange c. The lover S is pivotally mounted upon the lever P by the pivot P and a flat spring Y presses against the pin Y on the lever and holds the lever S normally out of use. The slide T is held normally out of use by the coil spring X seated in the aperture in the flange c and pressing on a ball which lies in a shallow pocket in the slide T. The pin T extends from the lever S so that when the slide T is moved downwardly the pin T will engage the lever L and make aidirect connection between the lever L and the indicator L; so as to show' the surface variations without exaggeration.

The shank A may be made hollow to receive the center point W or a similar tool.

The object of the friction connection between they head H and the shank A and between the head H and the housing is to provide means for holding the indicator' in any adjusted position without the use of setscrews or the like and to provide means which will give way when the pressure is too great, as when the irregularities of the surface are beyond the limits of the vibration of the indicator L.

In the operation of the indicator the contact point is placed against the surface of the work andthe shank A adjusted in the tool post until the indicator point L is at the center of the scale K so that in moving the contact point over the surface of the work the indicator point may move both ways from the center of the scale K.

I wish to call especial attention to the fact that the contact point B .and the indicator.V

point L move in the same direction, whereas in some other indicators they move in opposite directions, causing confusion tothe operator. The contact points B and B are rigid upon the lever P and equal rdistances from the pivot F. In eii'ect the lever P is a straight leve-r as distinguished from a bellcrank lever and the pressure against the con-` tact point B or against the contact point B in the operation of the indicator 1s never toward the pivot Fb-ut is at angles thereto.

What claim and desire to secure by Letters Patent isfy 1. In a surface indicator, a hollow shank; a head fitting against the end of the shank and having a ypintle` extending into the shank; means for holding the pintle in the shank and forming friction; a housing titting against the head; means for holding the housing against the head and forming friction so that the housing may rotate relative to the head and the head may rotate relative to the shank; and indicating mechanism carried by the head.

2. In a surface indicator, a housing having a scale thereon at one end; a, lever centrally pivoted in the housing; a contact point carried by one end of the lever and extending through `the housing near its scale end; a second contact point carried by the other end of the lever and extending `through ,the unscaled end of the housing at substantially right angles to the first contact point; a lever having an indicator point adapted for movement over the scale, and connections between said levers whereby said indicator -point is caused to move in the same direction as the first mentioned contact point.

3. In a surface indicator, a housing; a lever centrally pivoted in the housing; a contact point extending from each end of the lever through the housing, said points being substantially at right angles to each other; a lever having an indicator point extending through the housing; and a system of levers connecting `the lever having the indicator point to the lever carrying the contact points, so that movements of the contact points will be greatly exaggerated upon the scale.

4. In a surface indicator, a housing havinga scale thereon; aflever centrally pivoted in the housing; a contact point extending from each end of the lever through the housing, said points being substantially atV 5. In a surface indicator, a hollow shank;

a head fitting against the end yof the hollow shank and having a intle extending into the shank; means for olding the'pintle in the shank andcausin friction.; .a housing having a pintle exten ing into the head at right angles to the pintle in the shank; and meansLfor exerting pressure Vbetween the housing and head, vso that the housing may be angularly adjusted and held in its adjusted position.-

In witness whereof, I have hereunto affixed my signature k1n the presence of two witnesses.- JOI-IN W.GHEEN. VVitnesses:

C. L. JACKSON, F. D. KNIGHT. 

